СИСТЕМА ECD, Diagnostic DTC:19 (1)

DTC Code DTC Name
19 (1) Accelerator Position Sensor Circuit Malfunction

DESCRIPTION

Tech Tips


  • This is repair procedure of "accelerator pedal position sensor".

  • This electrical throttle system does not use a throttle cable.

  • This accelerator pedal position sensor is non-contact type.

The accelerator pedal position sensor is mounted in the accelerator pedal to detect the opening angle of the accelerator pedal. Since this sensor is electronically controlled with hall elements, accurate control and reliability can be obtained. It has the 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor.

In the accelerator pedal position sensor, the voltage applied to pedal terminals VPA and VPA2 of the ECM changes between 0 V and 5 V, in proportion to the opening angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction. The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2, and the ECM controls the injection pump based on these signals.

A01BDHYE06
DTC No. DTC Detecting Condition Trouble Area
19(1)

Condition (a), (b), (c) or (d) continues for 2.0 seconds:

(a) VPA <= 0.2 V and VPA2 <= 0.5 V

(b) VPA >= 4.8 V

(c) When 3.45 V >= VPA >= 0.2 V, and VPA2 >= 4.8 V

(d) VPA-VPA2 <= 0.02 V

  • Open or short in accelerator pedal position sensor circuit

  • Accelerator pedal position sensor

  • ECM

Condition (a) continues for 0.5 seconds:

(a) VPA <= 0.2 V or VPA2 <= 0.5 V

Tech Tips

After confirming DTC 19(1), use the intelligent tester to confirm the throttle valve opening percentage.

Trouble area Accelerator pedal position expressed as voltage
Accelerator pedal released Accelerator pedal depressed
ACCEL POS #1 ACCEL POS #2 ACCEL POS #1 ACCEL POS #2
VC circuit open 0 - 0.2 V 0 - 0.2 V 0 - 0.2 V 0 - 0.2 V
VPA circuit open or ground short 0 - 0.2 V 1.2 - 2.0 V 0 - 0.2 V 3.4 - 5.3 V
VPA2 circuit open or ground short 0.5 - 1.1 V 0 - 0.2 V 2.6 - 4.5 V 0 - 0.2 V
E2 circuit open 4.5 - 5.5 V 4.5 - 5.5 V 4.5 - 5.5 V 4.5 - 5.5 V

WIRING DIAGRAM

A01BFT8E01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

When using intelligent tester:

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (ACCELERATOR POSITION)


    1. A01BDFBE02

      Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch ON.

    3. Select the item "Powertrain/Engine and ECT/Data List/Accel position" and read its value displayed on the intelligent tester.

      OK
      Check that the value displayed on the intelligent tester changes by repeatedly depressing and releasing the accelerator pedal.

    NG

    CHECK HARNESS AND CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR) Click here

    OK

  2. READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Idle the engine for 15 sec. or more.

    4. Read the DTC Click here.

      Result
      Display (DTC output) Proceed to
      DTC 19(1) is output again A
      No DTC output B

    B

    SYSTEM OK

    A

    REPLACE ECM

  3. CHECK HARNESS AND CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR)


    1. A01BEBSE01

      Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM B8 and D4 connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VCP2 (B1-1) - VC (D4-1) Below 1 Ω
      EPA2 (B1-2) - E2 (D4-9) Below 1 Ω
      VPA2 (B1-3) - VPA2 (B8-12) Below 1 Ω
      VCPA (B1-4) - VCPA (B8-6) Below 1 Ω
      EPA (B1-5) - EPA (B8-4) Below 1 Ω
      VPA (B1-6) - VPA (B8-5) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VCP2 (B1-1) or VC (D4-1) - Body ground 10 kΩ or higher
      EPA2 (B1-2) or E2 (D4-9) - Body ground 10 kΩ or higher
      VPA2 (B1-3) or VPA2 (B8-12) - Body ground 10 kΩ or higher
      VCPA (B1-4) or VCPA (B8-6) - Body ground 10 kΩ or higher
      EPA (B1-5) or EPA (B8-4) - Body ground 10 kΩ or higher
      VPA (B1-6) or VPA (B8-5) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT ECM (VC AND VCPA VOLTAGE)


    1. A01BI0WE01

      Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified Condition
      VC (D4-1) - E2 (D4-9) 4.5 to 5.5 V
      VCPA (B8-6) - EPA (B8-4) 4.5 to 5.5 V

    NG

    REPLACE ECM

    OK

  5. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    NEXT

  6. READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Idle the engine for 15 sec. or more.

    4. Read the DTC Click here.

      Result
      Display (DTC output) Proceed to
      DTC 19(1) is output again A
      No DTC output B

    NG

    SYSTEM OK

    A

    REPLACE ECM

When not using intelligent tester:

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ECM - ACCELERATOR PEDAL POSITION SENSOR)


    1. A01BEBSE01

      Disconnect the accelerator pedal position sensor connector.

    2. Disconnect the ECM B8 and D4 connectors.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      VCP2 (B1-1) - VC (D4-1) Below 1 Ω
      EPA2 (B1-2) - E2 (D4-9) Below 1 Ω
      VPA2 (B1-3) - VPA2 (B8-12) Below 1 Ω
      VCPA (B1-4) - VCPA (B8-6) Below 1 Ω
      EPA (B1-5) - EPA (B8-4) Below 1 Ω
      VPA (B1-6) - VPA (B8-5) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      VCP2 (B1-1) or VC (D4-1) - Body ground 10 kΩ or higher
      EPA2 (B1-2) or E2 (D4-9) - Body ground 10 kΩ or higher
      VPA2 (B1-3) or VPA2 (B8-12) - Body ground 10 kΩ or higher
      VCPA (B1-4) or VCPA (B8-6) - Body ground 10 kΩ or higher
      EPA (B1-5) or EPA (B8-4) - Body ground 10 kΩ or higher
      VPA (B1-6) or VPA (B8-5) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT ECM (VC AND VCPA VOLTAGE)


    1. A01BI0WE01

      Disconnect the accelerator pedal position sensor connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified Condition
      VC (D4-1) - E2 (D4-9) 4.5 to 5.5 V
      VCPA (B8-6) - EPA (B8-4) 4.5 to 5.5 V

    NG

    REPLACE ECM

    OK

  3. REPLACE ACCELERATOR PEDAL ROD ASSEMBLY


    NEXT

  4. READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTC IS OUTPUT AGAIN)


    1. Clear the DTC Click here.

    2. Start the engine.

    3. Idle the engine for 15 sec. or more.

    4. Read the DTC Click here.

      Result
      Display (DTC output) Proceed to
      DTC 19(1) is output again A
      No DTC output B

    B

    SYSTEM OK

    A

    REPLACE ECM